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		<b>Sulphur dioxide (SO<sub>2</sub>)
		</b>
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				<h3>Guideline values</h3>
				<ul>
					<li>
						<label>20 &mu;g/m3 24-hour mean</label>
					</li>
					<li>
						<label>500 &mu;g/m3 10-minute mean </label>
					</li>
				</ul>

				<p>A SO<sub>2</sub> concentration of 500 &mu;g/m3 should not be exceeded over average periods of 10 minutes duration. Studies
					indicate that a proportion of people with asthma experience changes in pulmonary function and respiratory symptoms
					after periods of exposure to SO<sub>2</sub> as short as 10 minutes.</p>
				<p>
					The (2005) revision of the 24-hour guideline for SO<sub>2</sub>
					concentrations from 125 to 20 &mu;g/m3 was based on the
					following considerations.</p>

				<ul>
					<li>
						Health effects are now known to be associated with much lower levels of SO<sub>2</sub> than previously believed.
					</li>
					<li>A greater degree of protection is needed.</li>
					<li>
						Although the causality of the effects of low concentrations of SO<sub>2</sub> is still uncertain, reducing SO<sub>2</sub>
						concentrations is likely to decrease exposure to co-pollutants.
					</li>
				</ul>

				<h3>Definition and principal sources</h3>
				<p>
					SO<sub>2</sub> is a colourless gas with a sharp odour. It is produced from the burning of fossil fuels (coal and
					oil) and the smelting of mineral ores that contain sulphur. The main anthropogenic source of SO<sub>2</sub> is the
					burning of sulphur-containing fossil fuels for domestic heating, power generation and motor vehicles.
				</p>

				<h3>Health effects</h3>
				<p>
					SO<sub>2</sub> is a colourless gas with a sharp odour. It is produced from the burning of fossil fuels (coal and
					oil) and the smelting of mineral ores that contain sulphur. The main anthropogenic source of SO<sub>2</sub> is the
					burning of sulphur-containing fossil fuels for domestic heating, power generation and motor vehicles.
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				Source:
				<a href="http://www.who.int/mediacentre/factsheets/fs313/en/">WHO fact sheet on ambient (outdoor) air quality
					guidelines</a>
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